Pump



vJun@ 5, 1923.' 1,457,546

T. NAMURA PUMP Filedgjune 29. 1921 Eye/@rentar Timeo Namur@ Amechanism is simp una, .or wanner Geova, cannoni-Ira l ruins.

Application illed inne 29,

To all whom t may conce/m:

Be it known that I, TAKEo NAMURA, a citizen of the Empire of Japan, residing at Walnut Grove, in the and State of California, have inventednew and useful Improvements in Pumps, of

ywhich the followin is a specification.

This invention re ates to a pump and particularly pertains to a means for packing and loiling the sa'me.

It is a principal object of the present invention to provide a pump having liquid means for packing the piston within the 'pump cylinder,'to form a seal therebetween and for lubricating the piston, all of which le in construction Y and may be readily operated to produce the resul'ts desired.

.in which the piston is forme The present invention contemplates the use of a piston cylinder carrying a reciprocating piston whichpiston is fitted with means adapted to form a seal with the cylinder wall by an adjustable liquid pressure, said liquid being also used to lubrieate the piston.

The invention is illustrated by way of example in the accompanying drawings in which- Fig. 1 is a view in central longitudinal section through a pump .embodying the present invention; M

Fig. 2 is a view in transverse section through the pump as shown on the line 2--2, Fig. 1; y

Fig. 3 is a view showing in diagram an application of the present invention;

1g. 4 is an enlarged fragmentary view 1n transverse section showin the manner when piston rug are not required.

ferring more particularly to the drawings, 10 indicates a tubular pump cylinder -within the which cylinder is closed at its lower end a cap 11 and at its upper end by a'cap 12. Leading romth'e lower end of the cylinder is an outlet pipe 13. Reciprocating cylinder is a hollow iston 14. This piston 1s secured to ya tubu ar piston rod 15 which extends through an opening in the cap 12. Secured to the upper, end of 'piston rod is a fitting 15. This member may provided to receive the end of a pump lever 16, or may be formed with a handle grip, as commonly used 'on tire pumps. It will also be understood that thepresent invention is not.' limited to thwewf @Smelt I l pump,

county of Sacramento with a plurality of per carried by the screw` 1921. serial No. 481,243. l

but that the same structure might be embodied in the construction of large power driven pumps. 1 p q The portion of the piston rod 15 extending through the hollow iston 14: is formed orations 17. These perforations permit a liquid, such as oil, to circulate through the rod and into the vpiston. The wall of the piston is also forme with a plurality of .perforations, as indicated at 18. These perforations preferably occur in the back` wall of the plston ring grooves 19, thus outward pressure 'of the liquid will act against the piston rings 20 to force them' outwardly an prevent lleakage between the piston and the cylinder.

Extending longitudinally b the piston rod 15 and centrally thereof is a threaded screw 21. This screw .is rotatably mounted through' the member 15 and is provided with an operating nut 22. 'A stop collar 23 `is to prevent longitudinal movement thereof. A threaded nut 24 is carried upon' the screw, l and this in turn supports a piston 25. Thus, when the stem is rotated the nut and ipiston willmove along the piston rod, it being understood that the piston member 25 fits snugly withinY the tubular bore of the rod. l

ln the present instance, the bore of the piston rod is shown as circular in section, and for that reason a guide rod 26 is used to prevent rotation of the nut 24, This guide rod is secured by one end to the fitting 15 and extends through the iston rod an arallel to the screw 21. t is desirable that the fitting 15 shall be removably secured to the upper end of the piston rod, and for that -reason these parts are screwed together, as shown. in Fig. 1. An air bypass tube 27 extends through the piston and longitudinally thereof. The lower ond of this tube terminates within a valve cage 28 carried on the working en This valve cage is formed 4with air passageways 29, while within the cage a ball valve 30` is used.' `On the pressure stroke of the piston this valve will close the air passageway 27 and on-the return stroke away from the passageway to ermit the iiow ofair through the piston. he worlgin end of the piston .is flanged, as indicated at31, to protect the valve cage and to prevent damage to the end of the cylinder 11o v of the piston. 10o l will move within said Ithe piston and a considerable length of the tubular piston rod are filled with lubricating oil, or some other desired liquid. The piston is inserted within the cylinder lO, after which the cap 1Q- is placed in posit-ion. lf the piston does not lit properly, the screw 2l .may be rotated to force the pressure piston 25 along and within the piston rod and toward the main piston ll. rlhis will cause the liquid to be iorced outwardly through the openings l?" in the piston rod and tie opening 18 in the piston. The pressure will thus expand the piston rings and produce a tight iit between them and the cylinder wall. A small amount ci liquid will work its way between the rings and will be distributed the cylinder wall as 'the piston reciprocates. toward cylinder heat` 'll will cause the valve member to close the air by-pass :27, while a retraction oi the piston will open this valve and permit the piston to `freely' move.

ln the form of the device shown in Fig. d, the piston rings are eliminated. ln this case grooves are formed in the outer face of the piston wall to extend partially Jdierearound. These grooves'communicate with the perforations 18, thus making it possible for a lubricant, under pressure, to be forced out into the grooves and to form a seal with the cylinder. lt is to be understood that while lubricating oil has been. mentioned, it might be found advisable to use grease, heavy oil, or other liquids and semisolids.

It will thus be seen'that in the pump here disclosed simple means are provided for creating a desired fit between a piston and its cylinder, and at the same time lubricating the moving parts.

lVhile I have shown the preferred form of my invention, it is to be understood that various changes may be made in the device by those skilled in the art without depart- 1n from the spirit of the invention.

aving thus described my invention, what I claim and desire to secure by Letters Patent is: i

l. A pump comprising a c linder; a pist0n reciprocal therein; a fluid7 compartment piston and having outlet openings passing through the side walls of the piston; piston rings circumscribing the piston and covering said openings; a tubular piston rod connected with the piston and communicating with the fluid compartment therein; and means within said piston rod for giving fluid in said compartment a desired pressure.

2. A pump comprising a cylinder; a hollgw piston reciprocal within said cylinder, said piston being formed with a lubricatin chamber having outlet openings througl movement of the piston menace the side walls of the piston; piston rings circumscribing the piston and covering said openings; a tubular piston rod rigidly secured to the piston and communicating with the lubricating chamber, said rod adapted to be partially lled with a, liquid lubricant; and a piston adjustably secured within said tubular rod to create a. desired pressure upon the lubricant.

3. pump comprising a cylinder; a hollow piston reciprocal within said cylinder,

said piston being formed with a lubricating chamber having outlet openings through the side walls of the piston; piston rings circumscribing the piston and covering said openings; a tubular piston rod rigidly secured to the piston and communicating with the lubricatingr chamber, said rod adapted to be partially filled with a liquid lubricant; a longitudinally extending adjusting screw rotatably supported withinsaid piston rod; means for rotating the same; and a threaded piston carried by said screw and adapted to create a desired pressure upon the liquid within the rod and the chamber of the piston.

4. A pump comprising a cylinder; a hollow piston reciprocal within said cylinder, said piston being formed with a lubricating chamber having outlet openings through the side walls of the piston; piston rings circumscribing the piston and covering said openings; a tubular piston rod rigidly secured to the piston and communicating with the lubricating chamber, said rod adapted to be partially longitudinally extending adjusting screw rotatably supported within said piston r0d;

means for rotating the same; a threaded iston carried by said screw and adapte to create a desired pressure upon the liquid within the' rod and the, chamber of the piston; and means for preventing rotation of the threaded piston. 4

5. A pump comprising a cylinder; a hollow piston reciprocal within said cylinder, said piston being formed with a lubricating chamber having outlet openings through the side walls of the o enings; a tubular piston rod rigidly secured to the piston and communicating with the lubricating chamber, said rod adapted to be partially filled with a. liquid lubricant; a longitudinally extending adjusting screw rotatably supported wit-hin said pistonrod; means for rota-ting the same; a threaded piston carried by said screw and adapted to create a desired pressure upon the liquid within the rod and the chamber of the piston; means for preventing rotation of the threaded piston; and avalve controlling the by-pass through the piston.

TAKE() NAMURA.

filled with a liquid lubricant; a. 

